Magnetic brake.



B; W. ROBINSON.

MAGNETIC BRAKE.

AP PLIOATION FILED DEO.17, 1908.

Patented Dec .3, 1912.

2 SHEETS-SHEET 1.

Inventor Edward W. Robinson Witnesses E. W. RG-BZEISON.

MAGNETIC BRAKE. I

APPLICATION FILED DEG.17, 190a.

Patented Dec. 3,1912.

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T all whom itmay concern:

1Be itlknown thatI, EDWARD a. subject of the King of Great Britaimre Which siding at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improyements in Magnetic Brakes, of which the followingis a specification.

My invention relatestomagnetic brakes Figure 1 is an end eleyation of a magnetic brake embodying my invention; Fig; 2 is a cross-sectional view; Fig. '3 is a sectional View taken on the line 33 of Flg. 2, and

Fig. 1 is a'sect-ional View on the line H of V Fig.2, looking in the direction of'the arrows. 30'

Referring to the drawings, the frame 1 of my brake is fastened to the end member 2 of'a dynamo-electric machine by means of bolts 3., The magnet is supported by a member 1. This supporting member has an internal guiding surface 5, which is preferably cylindrical. The armature 6 of the magnet is operatively associated With the cylindrical thrust ring 7, which is preferably made of non-magnetic material, is guided by the surface 5 and is also operatively associated with the two sets of fric-. tion disks, one set of which is stationary and the other rotatable. It will thus be seen that my brake combines with the dynamoeleetric machine to form a compact and simple structure. 1

The supporting member 4 comprises an annular portion 8, of less diameter than the internal diameter of the frame 1, the interior of which forms the guiding surface 5 for the thrust ring, and two flange portions 9 and 10. Each flange has a shoulder, the

frame 1 engaging the shoulder 11 on the flange 10 and the frame 12 of the magnet I ,M'AGNE'TIG BRAKE.

Specification of Letters Patent. Application filed December 17, 1908. Serial No. 467,999.

. ROBINSON,

ROBINSON, or scHENEcTAnY, NEW YORK, AssIenoa-ro, GENERAL ELECTRIC COMPANY, A coaronarron or NEW YORK.

Patented Dec.3,1912.

- 6 l These flanges are held rigid by means of the portions of metal Hand bolts 15, which 'pass' through the frame 12 of the magnet, the portions 14 of the supporting member and into the frame 1 of the brake, and thus the magnet issupported entirely from the end members of the dynamo-electric machine. This supporting member also separates the magnet from the friction disks, .and by constructing it with flanges as clescribed, a large cooling surface is supplied near the friction disks which generate considerable heat. v

The magnet consists of the armature 6, the frame 12 invwhich' is placed the exciting coil. 16, and the member 1'7 which issiirrounded by the coil 16 and is made of magnetic material. The coil 16 is inclosed in a watertightnon-magnetic casing and is held in place by means .of the member 17 and the bronze ring 18. This member 17 has a flange portion 19 which fits over aportion of the ring 18 and by tightening the bolt 20, the member 17 and ring 18 together with the coil 16 are securely fastened to the magnet frame 12. The coil is excited from some source through the leads 21, which enter the inclosed terminal box 22 formed in the magnet frame. are placed in holes 24: and press upon the armature 6 near its periphery. The flux Springs 23 produced by .the coil 16 passes through the..

member 17 into the armatureand returns through the magnet frame. The thrust ring is preferably anannular ring formed with projections 25. Bolts 26pass through these projections and fasten the ring. 7to the magnet armature.

. A- spider 27 is keyed on the shaft 28 and kept from moving by the nut .29 and lockwasher 30. Friction disks 31- areslidably mounted on the keys 32 on the spider 27, so that they rotate with the spider and shaft. These plates are provided with holes 32' to facilitate their removal-,if necessary. Betweenthe rotatable disks '31 there are stationary friction disks 33 which are slidably mounted on keys 34 in the frame 1. These disks 33 are provided with oil grooves '37. The stationary disk nearest to the supporting member 4 extends inwardly farther than the other stationary disks, and has the thrust ring 7 pressing against it near its inner periphery.

55 engaging the shoulder 13 on the flange 9. i Oil plugs 35 are provided in the {frame so shape, but it is evident that oil may be "supplied to andremoved'.

from the friction disks. A cover 36is providedwhich isfastened to the frame '1 and incloses. the brakeat the motor bearing end of the brake. Itwill thus be seen that my brake is entirely inclosed and, when used in connection with an inclosed motor, may be partially or entirely submerged in Jwater without affecting its operation or permitting Water to enter-it.

The magnet coil is so designed that-with a certain amount of current flowing through it, the armature 6 will be attractedtowardthe member 17 and frame 12 against the actionof'the springs 23,-and'the shaft 28 with the disks 31 is free to' rotate ,without any interference from -the disks 33. When, however, the circuit of the coil is opened, the springs 23 force the armature 6 away from the member 17 and the frame, and'the thrust ring7, pressing against theoutside' stationary disk, transmits the pressure of the springs to all the disks, forces them all,

by Letters Patent of the United States, is,

1. In combination, a frame for a magnetic brake, a plurality of friction disks slidably but non-rotatably mounted in said frame, a shaft, a plurality of slidable friction disks mounted on said shaft and rotatable therewith, a magnet comprising an armature and a frame, a supporting member for said mag- 'net'fastened to said frame and having an in-- ternal guiding surface, a cylindrical thrust ring guided by said surface, saidthrust ring pressing against the non rotatable disk nearest the supporting frame near its inner periphery, and means for pressing the disks together to oppose the action of said magnet.

2. In combination, a fra mefor a magnetic brake, a plurality of friction disks slidably but non-rotatably mounted in said frame, a

' -shaft,a plurality of slidable friction disks netfastened to said frame and having an in mou lgt ed on said shaftand rotatable therewith t 'a magnet comprising an armature and a frame, a supporting member for said mag ternal guiding surface, a cylindrical thrust ring guided by said surface, said non-rotatable disk nearest said supporting member extending inwardly farther than the other of said non-rotatable disks and being pressed near its inner periphery by said thrust ring,

and means for pressing the disks together to oppose the action of said magnet.

. tion of said magnet.

"" Incombination, a brake frame, a plu'- I i'ality of friction disks'slidably but non-rowith, a magnet comprising a frame and an armature, a supporting member for said magnet comprising-"a portion having a guiding-surface and two flanged portions, one of said flanged portions being engaged by said brake frame and the other of said flangedtatably. mounted in said 'brake frame,"- a' 1 "shaft, a plurality of slidablefriction disks mounted'on said shaft and rotatable thereportions being engaged by the frameof said magnet, a thrust ring guided by said surface and operatively associated with said armature and with said friction disks, and means for pressingsaid disks together to 0ppose the action of said magnet- 4. In combination a brake frame, aph

rality offric'tion disks slidably but non-ro tatably mounted in said brake frame, a shaft, a plurality of slidable friction disks mounted on said shaft and rotatable therewith, a magnet-comprising a frame and an armature, a supporting member for said magnet comprising a'port-ion having a gu idmg surface and two flanged portions, one of.-

said flanged portions being engaged'bysaid brakeframe and the other of said flanged portions being engaged by said frame of the magnet, bolts passing through said flanged portions and said frames tolhold. said magnet in place, athrust ring guided by said surface and operatively associated with said armature and with said friction disks, and means for pressing said disks together to oppose the action of said magnet.

5. Incombination abrake frame, a plurality of friction disks slidably but non-rota tably mounted in said brake frame, a shaft, a plurality of friction disks mounted on said shaft and slidable therewith, a magnet comprising a frame and an armature, a sup- 1 porting member for said magnet comprising a portion having a guiding surface and two flanged portions, one of said flanged portions being engaged by said brake'frame and the other of said flanged portions being engaged by the frame of the magnet, bolts passing through said-flanged portions and said frameto hold said magnet in place, a thrust ring guided'by said surface and having projecti/ons, bolts passing through said projections for holding the thrust ring to said armature, said thrust ring being operatlvely associated with said frlct-icn disks,

and means acting on said. armature for pressmg the disks together to oppose the ac- 6. In combination a brake frame, a plurality of friction disks slidably but non-rotatably mounted in said brake frame, a shaft, a plurality of friction disks mounted on said shaft and slidable therewith, a magnet comprising-a frame and an armature, a' supportmg member for said magnet comprismg a portion having a guiding surface and two flanged portions, one of said flanged p 31%5tions being engaged by said brake frame-and ti ns being engaged by said brake frame a t e other. of said flanged portions being enga'ged by said frame of the magnet, bolts passing through said flanged portions and .Jsaid frames tohold said magnet in place, a

- thrust ring guided by said surface fastened to said armature and operatively associated With said friction disks, andsprings locatedin holes in the frame of said magnet and v pressing on said armature near its periphery tpoppose the action of said magnet. g: 7, In combination a brake frame, a 'plul zflllty of friction disks slidably but non-rotatably mounted in said brake frame, a shaft, a plurality of friction disks mounted on said shaft and slidable therewith, a magnet comprising a'frame and an armature, a support- 7 2Q ing'" member for said magnet comprising a flanged portions, one of said flanged perthe other of said flanged portions being enpassing through said flanged portions and said frames to hold said magnet in place, a thrust ring guided by said surface and fastened to said armature, said thrust 'ring pressing against the non-rotatable disk nearest the supporting frame, and means acting on said armature for pressing the disks together to oppose the action of said magnet.

' In Witness whereof, I- have hereunto set my hand this 15th day of December, 1908.

' EDWARD W. ROBINSON.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD.

Copies 01 this patent may be obtained for five cents 'each, by addressing the Commissioner of Patents,

' Washington, 1). c."

gaged by said frame of the magnet, bolts portion'having a guiding surface and two 

